are employed by chemists to lower the temperature at which chemical interactions may occur, and there are many kinds a a.lable. One of the simplest is a mixture of ammonium nitrate and water in equal parts, the dissolving of the salt causing a drop in temperature from 40 degrees F. to 40 F. By the use of a mixture of 2 parts snow or pounded ice and 1 part salt, a steady temperature of 40 F. can be maintained; while one of 2 parts snow and 3 parts crystallized calcium chloride will bring the temperature down from 32 degrees F. to 50 degrees F.

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